Catholicism is the worst in humanity? Pessimist, much? I won't disagree with Versailles, but it is still a beautiful Palace. It is still a wonder.
Wonder's don't have to evoke positive feelings, just feelings of awe.
Catholicism has done a great deal of good and a great deal of bad in its long, long history. Probably more good than bad, on balance! But St. Peter's, to me, represents the absolute moral nadir of the Church. While people starved, suffered under oppression and war, and generally lived in conditions of abject misery, the Church plundered Europe and half the world to fund the construction of a new St. Peter's (having torn down the old one, which I guess wasn't ostentatious enough). Conquistadors murdered and pillaged their way across the New World, stealing everything they could get their hands on, all in the name of the Church (a lot of that loot ended up in the Vatican; lots more of it helped pay for the fancy new church). The selling of indulgences, which is one of the ugliest, most wicked chapters in the Church's history, reached its zenith during the construction of St. Peter'sin order to
pay for St. Peter's. They finished building it in the middle of the Thirty Years' War, which is probably the worst calamity Europe has ever experienced, apart from the Holocaust and the Black Death. The money that they poured into St. Peter's (and into all their fancy clothes, wine, whoring, etc.) could have done literally immeasurable good for the common Christians of Europe, but the Church didn't merely ignore them, it
robbed them in order to pay for its excesses. It's horrible. It's an eternal stain on the name of the Church, and St. Peter's is the enduring monument that represents that stain.
Wonders should invoke awe, yeah. They don't have to be "good." Lots of slaves died building the Pyramids, which were just meant to glorify the Pharaohs. Not very noble. But the Pyramids represent extraordinary ingenuity, organizational skills, engineering prowess literally millennia ahead of the rest of the world, and they're tombs meant to glorify kings; St. Peter's is supposed to be a Christian church, but no Christian values are evident anywhere in its history. It's a symbol of venality and hypocrisy, of wealth and power abused by a Church that wasn't doing its appointed work.